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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4bba7d60de97343a0f77877e87a87ceb40340be4c114b1921fec0dc25d2c30c' 
  AND token = 'ShKNa1OStK9+cMQPKgFiDgn9dgST2aGkqffBOAN2N4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}